Healthfinder
The U.S. government's directory of authoritative health information including links to online journals, medical dictionaries, and prevention and self-care informationhttp://www.healthfinder.gov/

MayoClinic.com
Easy-to-understand information on health and medical topics, all reviewed for accuracy by Mayo Clinic experts. (A service of Mayo Foundation for Medical Education and Research)
http://www.mayoclinic.com/

Search engines , such as Google, or bing, or Ask.com match key words. See links from Library Home Page. Most programs only require the entry of all terms wanted--it only returns pages that include all of your search terms. For a better search, use quotation marks ("....") around phrases: "West Nile Virus" and choose domains that tend to have better quality information by adding site:.gov or site:.edu to your search term.

Go to Yahoo at http://video.yahoo.com. Enter term(s)you want presented in video. Be sure to watch the timing --some of these streaming videos are over one hour in length.
Go to Blinkx at http://www.blinkx.com and type in term(s) you wish to match. Click on the thumbnail of videos you wish to see. Sometimes ads precede the content if on an advertiser-sponsored channel (Fox and others). YouTube videos may load slowly, if at all.